Every sentence, its source
Click a claim and ProofJump highlights the exact passage on the page it came from.
sentence anchor
PJ
Research · evidence
ProofJump verifies an AI answer sentence-by-sentence, back to the source.
For every claim in an AI answer, jump to where it actually appears in the page — or see that it has no source. It sells verifiability, not another AI sidebar.
Recommended for your browser
Choose where to install
Official stores are the safest choice and provide automatic updates.
CH
Chrome
Detected: Chrome
Other browsers
Developer / manual installation
Use the ZIP only when an official store is unavailable.
- Unzip the file, open the browser's Extensions page, enable Developer mode, then choose Load unpacked.
Manual installations do not update automatically. ZIP files are not one-click installers.
product screenshot · ProofJump sidepanel
product screenshot · ProofJump options
Or exposes the gap
When a claim has no matching source, it says so plainly instead of hiding it.
honest by designWhat Pro buys
Bring-your-own-key AI, cross-document verification and export of a checked answer.
Pro from $3.99/moPricing
Buy right here — checkout is handled by Paddle.
Free
$0
Choose where to install- Sentence-to-source anchoring
- Highlight on page
- Single-page verification
Pro
$3.99/mo $29/yr $59one-time
Paid account access is currently available in the Chrome version only.
Secure checkout by Paddle · cards, Alipay, WeChat Pay
- Everything in Free
- Bring-your-own-key AI
- Cross-document verification
- Export checked answers
Team
Coming soon
Contact sales- Everything in Pro
- Shared workspaces
- Centralized billing
- 5+ seats
The bundle is not available yet. Individual paid extensions are available now; join the waitlist for bundle updates. Join waitlist →
Private by construction
local-first · optional online features disclosed · no data sold
- No analytics
- No telemetry
- No third-party SDKs
- Core processing stays local; optional sync, backup, AI or sharing connects only when you enable it
Questions people ask
Does it call an AI service?
Only if you enable it with your own key. The core anchoring runs locally on the page you're reading.
What if the answer has no source?
ProofJump marks the claim as unsupported — surfacing gaps is the whole point.
Which pages does it work on?
Any readable article or paper page; it anchors claims against the visible text.
Questions & suggestions
Ask a question, request a feature or report an issue. We read every message and publish the useful ones with our answer.
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